Anyone swapped in a 12v lift pump in a 24v

[BarryG]

Getting ready to put in a cam in the next month or two. The cam will have the lift pump lobe on it. So I am seriously considering converting to a 12 valve style lift pump. I know it puts out too much pressure out of the box so anyone on here done it and what do I need to look out for. Anyone know of a good regulator w/bypass to use?

 

[KLockliear]

We have done it on a few 24v's. No bypass either. Never lost a VP pump from it.

 

[Fishin Guide]

Same here. I run it full boar. 45-47pi at idle, 37psi WOT over 70K miles.



I keep waiting fro my VP seals to "rupture". :-laf



By far the best fueling mod I have ever made. I was at 22 psi WOT before the DrawStraw. And then the DrawStraw was born...



Dave

 

[RHestand]

My 98 pump makes about 30 PSI most of the time. At WOT it drops to 23-25 PSI.

Is this normal ?

I've had two dif. gauges, and both read the same.

TIA, Ray

 

[Joe G.]

Those pressures are fine. Actually, it will run pretty good at lower pressures if the overflow valve is getting bad. When my OF valve failed mine was down to 6 PSI before I got home. It refused to restart at that pressure. A new OF valve from TST makes my pressure at about 30 PSI or a little more at idle. 40 PSI on the road.

 

[KCraft]

does the stock 24v cam have the lobe on it for the mech. lp??? or do you have to swap cams???

 

[Fishin Guide]

does the stock 24v cam have the lobe on it for the mech. lp??? or do you have to swap cams???

The cam must be swapped out.



Dave

 

[RHestand]

Joe G. , thanks for the reply, and also also for your very informative articles on the 12V fuel systems.

Question: What went wrong with your OF valve?

I pulled mine apart, chasing a low boost problem. I think it all looked pretty good, so I streched the spring a little bit, put it back together, and installed.

TIA,Ray